SRC/dlaisnan.f(3)

NAME
SRC/dlaisnan.f

SYNOPSIS

  Functions/Subroutines
logical function dlaisnan (din1, din2)
DLAISNAN tests input for NaN by comparing two arguments for inequality.

Function/Subroutine Documentation

  logical function dlaisnan (double precision, intent(in) din1, double precision, intent(in) din2)

DLAISNAN tests input for NaN by comparing two arguments for inequality.

Purpose:

    !>
    !> This routine is not for general use.  It exists solely to avoid
    !> over-optimization in DISNAN.
    !>
    !> DLAISNAN checks for NaNs by comparing its two arguments for
    !> inequality.  NaN is the only floating-point value where NaN != NaN
    !> returns .TRUE.  To check for NaNs, pass the same variable as both
    !> arguments.
    !>
    !> A compiler must assume that the two arguments are
    !> not the same variable, and the test will not be optimized away.
    !> Interprocedural or whole-program optimization may delete this
    !> test.  The ISNAN functions will be replaced by the correct
    !> Fortran 03 intrinsic once the intrinsic is widely available.
    !>

Parameters
    DIN1

    !>          DIN1 is DOUBLE PRECISION
    !>

    DIN2

    !>          DIN2 is DOUBLE PRECISION
    !>          Two numbers to compare for inequality.
    !>

Author
    Univ. of Tennessee

    Univ. of California Berkeley

    Univ. of Colorado Denver

    NAG Ltd.

Definition at line 73 of file dlaisnan.f.

Author

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